Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48ecee52c6fc2a1…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 01:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9357c16be4f29a88a8729b1ab710909a SHA-1: 96f9139ffd3d7c36e2c44f268a49d468173d852e SHA-256: a48ecee52c6fc2a148c5a4594b685fbee8850d99d08b6d9be432865da5c16392
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The document body and embedded URLs suggest a lure related to 'Bhai dooj quotes' and other topics, likely to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/123?utm_term=bhai+dooj+quotes PDF link annotation
    • https://cdn.sqhk.co/bidelefo/4ifhilG/94230258855.pdfIn PDF document text
    • http://zulojijimom.iblogger.org/is-_200._c_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/Cifglsu/santa_video_call_and_tracker_app.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/fegehgM/toddler_popping_bubble_wrap_with_head.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/h7aCyXo/4555196533.pdfIn PDF document text
    • http://pavawafupef.66ghz.com/is_python_a_good_language_to_learn_reddit.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/mahabharata_full_story_in_english_free_download.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/download_kitab_al_mughni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/74880188353.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/draper_esprit_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de059b8b-7128-43ec-965e-33b5f52d0aa5/65492179190.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/service_apartment_guidelines.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/how_much_does_a_hvac_tech_make_in_maryland.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/is_it_hard_to_pledge_delta_sigma_theta.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/one_less_bell_to_answer_fifth_dimension.pdfIn PDF document text
    • http://vizaraxeforuzu.rf.gd/10920143561.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/chromecast_extension_for_pc.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_c9344a20ac874e71aac6d10818f5d274.pdf?index=trueIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_58786c46831c489283477de5c11ae8b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef45d731-314d-4462-b409-1b8d658ec5cd/napak.pdfIn PDF document text
    • http://fekabama.epizy.com/the_world_of_the_witcher_compendium.pdfIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_f7dc7a7d54dd4eb29e1f4933e016d36a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/498b8f02-7eaa-4382-a7d9-482ccc6f6cff/what_is_lucian_freud_known_for.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 5036 bytes
SHA-256: 46c92810b1e9127ad185f73372ac1a100929bc2c65062e3534b9210e824be84b
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 1936 bytes
SHA-256: a8ba320a0ac8a73a5a8cc2c47ba30bd151ec5f51af4d5ac0b9daf85eaa8f1301
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 11188 bytes
SHA-256: 026faeb88a00f144be63c551460c14b535563d54707cb26a5c603c97e0080b43